What Is Force.
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- A force is an effort that changes the state of an object at rest or at motion.
- It can change an object's direction and velocity.
- Force can also change the shape of an object.
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✦ Normal force :
- The normal force is the force that surfaces exert to prevent solid objects from passing through each other.
✦ Applied force :
- An applied force is a force that is applied to an object by a person or another object.
✦ Frictional force :
- Frictional force refers to the force generated by two surfaces that contacts and slide against each other.
✦ Tension force :
- The tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
✦ Spring force :
- The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it.
✦ Resisting force :
- Resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body.
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Force is push or pull acting on a body which tends to change its state of rest or of motion. It is denoted by "F". It has a magnitude and a direction.
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Here,
" m " = Mass of the body
" a " = Acceleration
" F " = Force
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Derivation of Force [ F = ma ] using Newton's law of motion.
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Unit of Force :-
- SI unit of force is Newton(N).
- C.G.S (centimetre gram second) unit of force is Dyne.
Effects of force -
- Force can change the direction of a moving object.
- Force can change the shape and size of an object.
- Force can change the speed of a moving object.
- Force can change a body′s state of motion or rest.
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Force is classified into two category:-
Contact Force
- Muscular Force
- Frictional Force
- Normal Force
- Applied force
- Tension Force
- Spring Force
- Air resisting Force
Non−contact Force
- Gravitational Force
- Magnetic Force
- Electrostatic Force
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